Welding device for municipal road pipeline laying

Abstract

The invention relates to the technical field of metal welding, and discloses a municipal road pipeline laying welding device which comprises a handle and further comprises a clamping mechanism, the clamping mechanism is arranged on the outer wall of the handle and comprises a swing plate, the swing plate is fixedly connected with the outer wall of the handle, a first sliding groove is formed in the outer wall of the swing plate, and a second sliding groove is formed in the outer wall of the first sliding groove. The groove wall of the first sliding groove is slidably connected with the outer wall of the limiting plate, the inner wall of the swing plate is slidably connected with the outer wall of the air cylinder through a sliding block, the output end of the air cylinder is fixedly connected with the outer wall of the limiting plate, and the inner wall of the swing plate is slidably connected with the outer wall of the first supporting plate. According to the welding device for municipal road pipeline laying, the clamping mechanism is arranged and used for positioning and clamping a road pipeline, so that the rotating center of the welding device is coaxial with the axis of the pipeline, operation of workers is facilitated, the situation that the quality is reduced due to the fact that the pipeline cannot be kept coaxial under the condition that the operation environment is small is prevented, and the welding device for municipal road pipeline laying can be normally used.

Description

Technical Field

[0001] The invention relates to the technical field of metal welding, in particular to a welding device for laying municipal road pipelines. Background Art

[0002] With the development of urban construction and the continuous advancement of municipal road projects, the demand for pipeline laying is increasing. The quality and efficiency of pipeline laying have become the key. In this context, welding devices specially used for municipal road pipeline laying have been produced, which provide more stable and efficient welding solutions for pipeline connection operations.

[0003] The patent application with application number CN202222742935.X discloses a municipal road pipeline laying device, including a municipal pipeline laying platform, the top of which is fixedly connected to a side handle by a hexagon socket bolt, the top of which is fixedly connected to a base by a hexagon socket bolt, and the top of the base is fixedly connected to a pipeline clamp.

[0004] However, during the process of laying road pipelines, the environment is usually complex and the space is small, which makes it impossible to ensure the coaxiality of the pipeline docking. It is difficult for welders to achieve ideal welding effects when operating in such a restricted environment, resulting in uneven welding quality and difficulty in improving efficiency, which limits the use of a welding device for laying municipal road pipelines. Summary of the invention

[0005] The object of the present invention is to provide a welding device for laying municipal road pipelines to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a welding device for laying municipal road pipelines, comprising a handle and: The clamping mechanism is arranged on the outer wall of the handle, and the clamping mechanism comprises a swinging plate, and the swinging plate is fixedly connected to the outer wall of the handle, and the outer wall of the swinging plate is provided with a sliding groove 1, and the groove wall of the sliding groove 1 is slidably connected to the outer wall of the limit plate, and the inner wall of the swinging plate is slidably connected to the outer wall of the cylinder through a sliding block, and the output end of the cylinder is fixedly connected to the outer wall of the limit plate, and the inner wall of the swinging plate is slidably connected to the outer wall of the support plate 1. The outer wall of the support plate 1 is provided with a positioning mechanism, and a supporting mechanism is arranged inside the support plate 1, the inner wall of the support plate 1 is slidably connected to the outer wall of the welding head, and the outer wall of the welding head penetrates the support plate 1 and is fixedly connected to the inner wall of the swinging plate, and the outer wall of the welding head is provided with a spring 1, and the end of the spring 1 is fixedly connected to the inner wall of the support plate 1 near the support plate 1, and the inner wall of the support plate 1 is provided with a limiting hole, and the welding head is used to weld the gap of the road pipeline, and the cylinder is a power source for clamping the road pipeline.

[0007] The cam is connected with the outer wall of the hinged plate by the hinge block, and the outer wall of the hinged plate is connected with the outer wall of the hinged plate by the hinge block.

[0008] According to the above technical solution, the outer wall of the support block one is hingedly connected to the end of the clamping block close to the support block one through a rotating shaft, the outer wall of the clamping block is provided with a sliding groove two, the groove wall of the sliding groove two is slidably connected to the outer wall of the support block two, the end of the support block two away from the sliding groove two is hingedly connected to the end of the support column close to the support block through a rotating shaft, the inner wall of the clamping block is rotatably connected to the outer wall of the roller through the rotating shaft, the clamping block is used to clamp the road pipe, the outer wall of the roller is in contact with the outer wall of the road pipe and rolls along the outer wall of the road pipe, and is used to guide the welding joint that rotates along the road pipe when welding the road pipe.

[0009] According to the above technical solution, the supporting mechanism includes a second supporting rod, an outer wall of the second supporting rod is slidably connected to the wall of the limiting hole, an end of the second supporting rod away from the first supporting plate is slidably connected to the outer wall of the second supporting plate through a slider, a third sliding groove is provided on the outer wall of the second supporting plate, a third sliding groove wall is slidably connected to the outer wall of the welding head, the outer wall of the second supporting plate is fixedly connected to an end of the first spring close to the second supporting plate, the inner wall of the second supporting plate is in contact with the outer wall of the road pipe, and is used to support the road pipe while keeping the welding head at an appropriate distance from the road pipe.

[0010] According to the above technical solution, the outer wall of the second support plate is hingedly connected to the end of the adjusting rod near the second support plate through a rotating shaft, the outer wall of the adjusting rod is slidably connected to the inner wall of the limiting sleeve, the inner wall of the limiting sleeve away from the adjusting rod is slidably connected to the outer wall of the hinge rod, the end of the hinge rod away from the limiting sleeve is hingedly connected to the inner wall of the third support block, the end of the support block three away from the hinge block is fixedly connected to the outer wall of the first support plate, and the adjusting rod is used to support and limit the second support plate and adjust the position of the second support plate and the welding head.

[0011] According to the above technical solution, there are two groups of limit plates, which are symmetrically arranged inside the sliding groove with the center line of the swing plate as the symmetry axis. The two groups of limit plates are symmetrically arranged for the positioning mechanism to symmetrically position and clamp the road pipe.

[0012] According to the above technical solution, there are two groups of clamping blocks, support block 2 and rollers, and the two groups of clamping blocks, support block 2 and rollers are symmetrically arranged on the outer wall of support block 2 with the center line of support block 1 as the symmetry axis. The two groups of clamping blocks, support block 2 and rollers are symmetrically arranged for positioning and clamping road pipes.

[0013] According to the above technical solution, there are four groups of positioning mechanisms. The two groups of positioning mechanisms located on the left side of support plate one are symmetrically arranged on the outer wall of support plate one with the center line of support plate one as the symmetry axis. The two groups of positioning mechanisms located on the right side of support plate one are symmetrically arranged on the outer wall of support plate one with the center line of support plate one as the symmetry axis and the two groups of positioning mechanisms located on the left side of support plate one. The four groups of positioning mechanisms are used to position and clamp the road pipe.

[0014] According to the above technical solution, there are two groups of support rods, and the two groups of support rods are symmetrically arranged on both sides of the outer wall of the support plate 2 with the center line of the support plate 2 as the symmetry axis. The support rods are used to limit the position of the support plate 2 so that the compression spring 1 can be stably contracted when the support plate 2 supports the road pipeline.

[0015] According to the above technical solution, the number of the adjusting rods, limiting sleeves and hinged rods are all four groups. The two groups of the adjusting rods, limiting sleeves and hinged rods located above the support plate two are symmetrically arranged on both sides above the support plate two with the center line of the support plate two as the symmetry axis. The two groups of the adjusting rods, limiting sleeves and hinged rods located below the support plate two are symmetrically arranged with the center line of the support plate two as the symmetry axis with the two groups of adjusting rods, limiting sleeves and hinged rods located above the support plate two. When the welding head swings, the support plate two can still support the road pipeline.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The municipal road pipeline laying welding device is provided with a clamping mechanism, through which the road pipeline is positioned and clamped, so that the rotation center of the welding device is kept coaxial with the pipeline axis, which is convenient for the staff to operate and prevents the pipeline from being unable to be kept coaxial in a small operating environment, resulting in reduced welding quality, so that the municipal road pipeline laying welding device can be used normally.

[0017] 2. The municipal road pipeline laying welding device is provided with a positioning mechanism, through which the road pipeline is clamped and positioned, and the welding device can be rotated along the outer wall of the pipeline, which is convenient for the staff to operate and enables the municipal road pipeline laying welding device to be used normally.

[0018] 3. The municipal road pipeline laying welding device is provided with a supporting mechanism, which supports the road pipeline and adjusts the position of the welding head at the same time, so that the welding head maintains a good welding position, improves the welding efficiency of the staff, and enables the municipal road pipeline laying welding device to be used normally.

[0019] 4. The municipal road pipeline laying welding device is provided with a roller, which guides the welding device. After the road pipeline is positioned and clamped by the positioning mechanism and the clamping mechanism, the welding device can keep rotating around the road pipeline stably, which is convenient for operators to perform welding operations and enables the municipal road pipeline laying welding device to be used normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the clamping mechanism of the present invention; Figure 3 It is a structural schematic diagram of the clamping mechanism of the present invention; Figure 4 It is a structural schematic diagram of the positioning mechanism of the present invention; Figure 5 It is a structural schematic diagram of the positioning assembly of the present invention; Figure 6 It is a structural schematic diagram of the support mechanism of the present invention; Figure 7 It is a structural schematic diagram of the support mechanism of the present invention; Figure 8 It is a cross-sectional view of the limiting sleeve in the support mechanism of the present invention.

[0021] In the figure: 1. handle; 2. clamping mechanism; 201. swing plate; 202. sliding groove 1; 203. cylinder; 204. limit plate; 205. support plate 1; 206. welding head; 207. spring 1; 208. limit hole; 3. positioning mechanism; 301. support rod 1; 302. hinge plate; 303. support column; 31. positioning assembly; 311. sliding rod; 312. spring 2; 313. support block 1; 314. clamping block; 315. sliding groove 2; 316. support block 2; 317. roller; 4. support mechanism; 401. support plate 2; 402. sliding groove 3; 403. support rod 2; 404. support block 3; 405. adjustment rod; 406. limit sleeve; 407. hinge rod. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] For example, see Figure 1-Figure 4 The present invention provides a technical solution: a welding device for laying municipal road pipelines, including a handle 1, and also including: The clamping mechanism 2 is arranged on the outer wall of the handle 1, and the clamping mechanism 2 includes a swing plate 201, the swing plate 201 is fixedly connected to the outer wall of the handle 1, a sliding groove 202 is provided on the outer wall of the swing plate 201, the groove wall of the sliding groove 202 is slidably connected to the outer wall of the limit plate 204, the inner wall of the swing plate 201 is slidably connected to the outer wall of the cylinder 203 through a slider, the output end of the cylinder 203 is fixedly connected to the outer wall of the limit plate 204, the inner wall of the swing plate 201 is slidably connected to the outer wall of the support plate 205, and the outer wall of the support plate 205 is provided with a positioning mechanism 3 A support mechanism 4 is provided inside the support plate 205, the inner wall of the support plate 205 is slidably connected to the outer wall of the welding head 206, the outer wall of the welding head 206 penetrates the support plate 205 and is fixedly connected to the inner wall of the swing plate 201, a spring 207 is provided on the outer wall of the welding head 206, one end of the spring 207 close to the support plate 205 is fixedly connected to the inner wall of the support plate 205, a limiting hole 208 is provided on the inner wall of the support plate 205, the welding head 206 is used to weld the gap of the road pipeline, and the cylinder 203 is used as a power source for clamping the road pipeline; The positioning mechanism 3 includes a support rod 301, the outer wall of the support rod 301 near the limiting plate 204 is slidably connected to the outer wall of the limiting plate 204, the end of the support rod 301 away from the limiting plate 204 is hinged to the outer wall of the hinge plate 302 through a hinge block, the end of the outer wall of the hinge plate 302 near the support plate 205 is hinged to the outer wall of the support plate 205 through a hinge block, the inner wall of the support plate 205 is fixedly connected to the end of the support column 303 near the support plate 205, and a positioning component 31 is arranged inside the hinge plate 302, the hinge plate 302 is used to position the road pipe, and the limiting plate 204 drives the support rod 301 so that the hinge plate 302 drives the positioning component 31 to clamp the road pipe; There are two groups of limit plates 204, and the two groups of limit plates 204 are symmetrically arranged inside the sliding groove 202 with the center line of the swing plate 201 as the symmetry axis. The two groups of limit plates 204 are symmetrically arranged for the positioning mechanism 3 to symmetrically position the road pipe and clamp it so that the two groups of pipes remain coaxial after clamping, which is convenient for welding.

[0024] The working principle of this embodiment is as follows: when the welding device for laying municipal road pipelines is put into use, the output end is extended by starting the cylinder 203, and the hinged plate 302 is driven to open by the support rod 301 and the limit plate 204, so that the road pipeline to be welded is placed in the hinged plate 302, and the starting cylinder 203 drives the limit plate 204 to slide and retract in the sliding groove 202, and the hinged plate 302 drives the positioning component 31 to contact the outer wall of the pipeline, and clamps the pipeline through the positioning mechanism 3, and the hinged plate 302 is continuously tightened until the clamping is completed, and the support mechanism 4 supports the pipeline, and at the same time, the compression spring 207 is used to adjust the position of the welding head 206, and after the clamping is completed, the welding head 206 is adjusted to align with the weld for welding, and after the welding is completed, the limit plate 204 drives the hinged plate 302 to open by starting the cylinder 203, and the positioning mechanism 3 and the support mechanism 4 release the clamping of the pipeline, and the welding device is removed for the next welding.

[0025] For example 2, please refer to Figure 5 The present invention provides a technical solution: the positioning assembly 31 includes a sliding rod 311, the outer wall of the sliding rod 311 is slidably connected to the inner wall of the hinge plate 302, the bottom of the sliding rod 311 is fixedly connected to the outer wall of the support block 1 313, the outer wall of the sliding rod 311 is provided with a spring 2 312, one end of the spring 2 312 is fixedly connected to the outer wall of the hinge plate 302, and the other end is fixedly connected to the outer wall of the support block 1 313, the support block 1 313 contacts the outer wall of the road pipe, and is used to position the road pipe to prevent the pipe from sliding and deviating due to thermal expansion during welding; The outer wall of the support block 1 313 is hingedly connected to the clamping block 314 near the end of the support block 1 313 through a rotating shaft, and the outer wall of the clamping block 314 is provided with a sliding groove 2 315, and the groove wall of the sliding groove 2 315 is slidably connected to the outer wall of the support block 2 316, and the end of the support block 2 316 away from the sliding groove 2 315 is hingedly connected to the end of the support column 303 near the support block 1 313 through a rotating shaft, and the inner wall of the clamping block 314 is rotatably connected to the outer wall of the roller 317 through the rotating shaft, and the clamping block 314 is used to clamp the road pipe, and the outer wall of the roller 317 contacts the outer wall of the road pipe and rolls along the outer wall of the road pipe, and is used to guide the welding joint 206 when the road pipe is welded, so that the welding device rotates along the road pipe under the guidance of the roller 317 during the welding process, and the welding joint 206 is always consistent with the weld position; The number of the clamping block 314, the second support block 316 and the roller 317 is two groups, and the two groups of clamping blocks 314, the second support block 316 and the roller 317 are symmetrically arranged on the outer wall of the second support block 316 with the center line of the first support block 313 as the symmetry axis. The two groups of clamping blocks 314, the second support block 316 and the roller 317 are symmetrically arranged for positioning and clamping the road pipe; There are four groups of positioning mechanisms 3. The two groups of positioning mechanisms 3 located on the left side of the support plate 205 are symmetrically arranged on the outer wall of the support plate 205 with the center line of the support plate 205 as the symmetry axis. The two groups of positioning mechanisms 3 located on the right side of the support plate 205 are symmetrically arranged on the outer wall of the support plate 205 with the center line of the support plate 205 as the symmetry axis and the two groups of positioning mechanisms 3 located on the left side of the support plate 205. The four groups of positioning mechanisms 3 are used to position and clamp the road pipe.

[0026] The working principle of this embodiment is as follows: during the clamping process, the hinged plate 302 drives the support block 1 313 to contact the outer wall of the pipe, and the support block 1 313 compresses the spring 2 312 to slide on the inner wall of the hinged plate 302. At the same time, the clamping block 314 drives the roller 317 to contact the outer wall of the pipe and roll along the outer wall of the pipe through the support column 303. At the same time, the support column 303 supports the support block 2 316, and the support block 2 316 slides on the inner wall of the sliding groove 2 315. The support block 1 313 and the roller 317 completely fit the outer wall of the pipe. After the clamping is completed, welding is carried out. During the welding process, the roller 317 supports the welding device to rotate along the outer wall of the pipe to weld the weld until the welding is completed.

[0027] For example 3, please refer to Figure 6-Figure 8 The present invention provides a technical solution: the support mechanism 4 includes a second support rod 403, the outer wall of the second support rod 403 is slidably connected to the hole wall of the limiting hole 208, the end of the second support rod 403 away from the first support plate 205 is slidably connected to the outer wall of the second support plate 401 through a slider, the outer wall of the second support plate 401 is provided with a sliding groove 3 402, the groove wall of the sliding groove 3 402 is slidably connected to the outer wall of the welding head 206, the outer wall of the second support plate 401 is fixedly connected to the end of the spring 1 207 close to the second support plate 401, and the inner wall of the second support plate 401 is in contact with the outer wall of the road pipe, so as to support the road pipe while keeping the welding head 206 at a suitable distance from the road pipe; The outer wall of the second support plate 401 is hingedly connected to one end of the adjusting rod 405 close to the second support plate 401 through a rotating shaft, the outer wall of the adjusting rod 405 is slidably connected to the inner wall of the limiting sleeve 406, the inner wall of the limiting sleeve 406 away from the adjusting rod 405 is slidably connected to the outer wall of the hinge rod 407, the end of the hinge rod 407 away from the limiting sleeve 406 is hingedly connected to the inner wall of the third support block 404, the end of the support block 404 away from the hinge block is fixedly connected to the outer wall of the first support plate 205, the adjusting rod 405 is used to support and limit the second support plate 401, and at the same time adjust the position of the second support plate 401 and the welding head 206; There are two groups of support rods 403, which are symmetrically arranged on both sides of the outer wall of the support plate 401 with the center line of the support plate 401 as the symmetry axis. The support rods 403 are used to limit the position of the support plate 401, so that the compression spring 207 can be stably contracted when the support plate 401 supports the road pipeline. There are four groups of adjusting rods 405, limiting sleeves 406 and hinged rods 407. The two groups of adjusting rods 405, limiting sleeves 406 and hinged rods 407 located above the support plate 401 are symmetrically arranged on both sides above the support plate 401 with the center line of the support plate 401 as the axis of symmetry. The two groups of adjusting rods 405, limiting sleeves 406 and hinged rods 407 located below the support plate 401 are symmetrically arranged with the center line of the support plate 401 as the axis of symmetry and the two groups of adjusting rods 405, limiting sleeves 406 and hinged rods 407 located above the support plate 401, so that when the welding head 206 swings, the support plate 401 can still support the road pipeline.

[0028] The working principle of this embodiment is: during the clamping process, the positioning mechanism 3 contacts the outer wall of the pipeline while the support plate 2 401 contacts the outer wall of the pipeline, and the compression spring 1 207 drives the welding head 206 to slide on the inner wall of the support plate 1 205, and adjusts the position of the welding head 206. After the clamping is completed, during the welding process, the operator drives the swing plate 201 to slide on the outer wall of the support plate 1 205 and the outer wall of the support rod 1 301 by shaking the handle 1, and at the same time, the welding head 206 slides on the inner wall of the sliding groove 3 402 to adjust the welding.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding device for laying municipal road pipelines, comprising a handle (1), characterized in that: Also includes: The clamping mechanism (2) is arranged on the outer wall of the handle (1), and the clamping mechanism (2) comprises a swinging plate (201), the swinging plate (201) is fixedly connected to the outer wall of the handle (1), the outer wall of the swinging plate (201) is provided with a sliding groove (202), the groove wall of the sliding groove (202) is slidably connected to the outer wall of the limit plate (204), the inner wall of the swinging plate (201) is slidably connected to the outer wall of the cylinder (203) via a slider, the output end of the cylinder (203) is fixedly connected to the outer wall of the limit plate (204), the inner wall of the swinging plate (201) is slidably connected to the outer wall of the support plate (205), and the outer wall of the support plate (205) is provided with a positioning mechanism. The support plate (205) is provided with a support mechanism (4) inside, the inner wall of the support plate (205) is slidably connected to the outer wall of the welding head (206), the outer wall of the welding head (206) penetrates the support plate (205) and is fixedly connected to the inner wall of the swing plate (201), the outer wall of the welding head (206) is provided with a spring (207), one end of the spring (207) close to the support plate (205) is fixedly connected to the inner wall of the support plate (205), the inner wall of the support plate (205) is provided with a limiting hole (208), the welding head (206) is used to weld the gap of the road pipe, and the cylinder (203) is used as a power source for clamping the road pipe.

2. A welding device for laying municipal road pipelines according to claim 1, characterized in that: The positioning mechanism (3) comprises a support rod 1 (301), the outer wall of the support rod 1 (301) close to the limiting plate (204) is slidably connected to the outer wall of the limiting plate (204), the end of the support rod 1 (301) away from the limiting plate (204) is hingedly connected to the outer wall of the hinge plate (302) through a hinge block, the end of the outer wall of the hinge plate (302) close to the support plate 1 (205) is hingedly connected to the outer wall of the support plate 1 (205) through a hinge block, the inner wall of the support plate 1 (205) is fixedly connected to the end of the support column (303) close to the support plate 1 (205), and a positioning component (31) is arranged inside the hinge plate (302), and the hinge plate (302) is used to position the road pipeline. The positioning assembly (31) is configured to be positioned, and the limiting plate (204) drives the support rod 1 (301) so that the hinge plate (302) drives the positioning assembly (31) to clamp the road pipe. The positioning assembly (31) comprises a sliding rod (311). The outer wall of the sliding rod (311) is slidably connected to the inner wall of the hinge plate (302). The bottom of the sliding rod (311) is fixedly connected to the outer wall of the support block 1 (313). The outer wall of the sliding rod (311) is provided with a spring 2 (312). One end of the spring 2 (312) is fixedly connected to the outer wall of the hinge plate (302), and the other end is fixedly connected to the outer wall of the support block 1 (313). The support block 1 (313) contacts the outer wall of the road pipe and is used to position the road pipe.

3. A welding device for laying municipal road pipelines according to claim 2, characterized in that: The outer wall of the support block 1 (313) is hingedly connected to one end of the clamping block (314) close to the support block 1 (313) through a rotating shaft, and the outer wall of the clamping block (314) is provided with a sliding groove 2 (315). The groove wall of the sliding groove 2 (315) is slidingly connected to the outer wall of the support block 2 (316). The end of the support block 2 (316) away from the sliding groove 2 (315) is hingedly connected to the end of the support column (303) close to the support block 1 (313) through a rotating shaft. The inner wall of the clamping block (314) is rotationally connected to the outer wall of the roller (317) through the rotating shaft. The clamping block (314) is used to clamp the road pipe, and the outer wall of the roller (317) contacts the outer wall of the road pipe and rolls along the outer wall of the road pipe, and is used to guide the welding joint (206) rotating along the road pipe when welding the road pipe.

4. A welding device for laying municipal road pipelines according to claim 1, characterized in that: The support mechanism (4) comprises a second support rod (403), the outer wall of the second support rod (403) is slidably connected to the hole wall of the limiting hole (208), the end of the second support rod (403) away from the first support plate (205) is slidably connected to the outer wall of the second support plate (401) through a slider, the outer wall of the second support plate (401) is provided with a third sliding groove (402), the groove wall of the third sliding groove (402) is slidably connected to the outer wall of the welding head (206), the outer wall of the second support plate (401) is fixedly connected to the end of the first spring (207) close to the second support plate (401), and the inner wall of the second support plate (401) is in contact with the outer wall of the road pipe, so as to support the road pipe while keeping the welding head (206) at a suitable distance from the road pipe.

5. A welding device for laying municipal road pipelines according to claim 4, characterized in that: The outer wall of the second support plate (401) is hingedly connected to one end of the adjusting rod (405) close to the second support plate (401) through a rotating shaft, the outer wall of the adjusting rod (405) is slidably connected to the inner wall of the limiting sleeve (406), the inner wall of the limiting sleeve (406) away from the adjusting rod (405) is slidably connected to the outer wall of the hinge rod (407), the end of the hinge rod (407) away from the limiting sleeve (406) is hingedly connected to the inner wall of the third support block (404), the end of the third support block (404) away from the hinge block is fixedly connected to the outer wall of the first support plate (205), and the adjusting rod (405) is used to support and limit the second support plate (401), and at the same time adjust the position of the second support plate (401) and the welding head (206).

6. A welding device for laying municipal road pipelines according to claim 1, characterized in that: The number of the limit plates (204) is two groups, and the two groups of limit plates (204) are symmetrically arranged inside the sliding groove (202) with the center line of the swing plate (201) as the symmetry axis. The two groups of limit plates (204) are symmetrically arranged to enable the positioning mechanism (3) to symmetrically position and clamp the road pipe.

7. A welding device for laying municipal road pipelines according to claim 3, characterized in that: The clamping blocks (314), the second support block (316) and the roller (317) are provided in two groups. The two groups of the clamping blocks (314), the second support block (316) and the roller (317) are symmetrically arranged on the outer wall of the second support block (316) with the center line of the first support block (313) as the axis of symmetry. The two groups of the clamping blocks (314), the second support block (316) and the roller (317) are symmetrically arranged for positioning and clamping the road pipe.

8. A welding device for laying municipal road pipelines according to claim 2, characterized in that: The number of the positioning mechanisms (3) is four groups. The two groups of the positioning mechanisms (3) located on the left side of the support plate 1 (205) are symmetrically arranged on the outer wall of the support plate 1 (205) with the center line of the support plate 1 (205) as the symmetry axis. The two groups of the positioning mechanisms (3) located on the right side of the support plate 1 (205) are symmetrically arranged on the outer wall of the support plate 1 (205) with the center line of the support plate 1 (205) as the symmetry axis with the two groups of positioning mechanisms (3) located on the left side of the support plate 1 (205). The four groups of the positioning mechanisms (3) are used to position and clamp the road pipe.

9. A welding device for laying municipal road pipelines according to claim 4, characterized in that: The number of the support rods 2 (403) is two groups, and the two groups of support rods 2 (403) are symmetrically arranged on both sides of the outer wall of the support plate 2 (401) with the center line of the support plate 2 (401) as the symmetry axis. The support rods 2 (403) are used to limit the position of the support plate 2 (401) so that the compression spring 1 (207) can be stably contracted when the support plate 2 (401) supports the road pipeline.

10. A welding device for laying municipal road pipelines according to claim 5, characterized in that: The number of the adjusting rods (405), the limiting sleeves (406) and the hinged rods (407) are all four groups. The two groups of the adjusting rods (405), the limiting sleeves (406) and the hinged rods (407) located above the second support plate (401) are symmetrically arranged on both sides above the second support plate (401) with the center line of the second support plate (401) as the symmetry axis. The two groups of the adjusting rods (405), the limiting sleeves (406) and the hinged rods (407) located below the second support plate (401) are symmetrically arranged with the center line of the second support plate (401) as the symmetry axis and the two groups of the adjusting rods (405), the limiting sleeves (406) and the hinged rods (407) located above the second support plate (401), so that when the welding head (206) swings, the second support plate (401) can still support the road pipeline.

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